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Ubin = 20x20
L Ubin = 20x20
L ubin = 400 cm2
L Ubin = 0,04 m2
L lantai/ Lubin
32/0,04 = 800. 800 ubin
jumlah ubin yang dibutuhkan
= luas lantai / luas 1ubin
= 32 ÷ 0,04
= 800 ubin ...